AMC1 ATM/ANS.OR.A.070 Contingency plans
ED Decision 2023/018/R
MODE S INTERROGATOR CODES
(a) An air traffic service provider should assess the possible impact on air traffic services of interrogator code conflicts, and the corresponding potential loss of Mode S target surveillance data from the impacted Mode S interrogators, taking into account their operational requirements and available redundancy.
(b) Unless the potential loss of Mode S target surveillance data has been assessed to have no safety significance, the surveillance provider should:
(1) implement monitoring means to detect interrogator code conflicts caused by other Mode S interrogators impacting eligible Mode S interrogators that they operate on any operational interrogator code;
(2) ensure that the interrogator code conflict detection provided by the implemented monitoring means is achieved in a timely manner and within a coverage that satisfy their safety requirements;
(3) identify and implement as appropriate, a fallback mode of operation to mitigate the possible interrogator code conflict hazards on any operational code, identified in the assessment referred to in point (1);
(4) ensure that the implemented fallback mode of operation does not create any interrogator code conflict with other Mode S interrogators referred to in the interrogator code allocation plan.
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